HP 6120 oobm, maxttl, traceroute, traceroute, Figure C-14.Example of a Completed Traceroute Enquiry

Troubleshooting

Diagnostic Tools

[source <ip-addr vlan-id> oobm]

The source IP address or VLAN. The source IP address must be owned by the router. If a VLAN is specified, the IP address associated with the specified VLAN is used. For switches that have a separate out-of-band management (OOBM) port, oobm specifies that the traffic originates from the out-of- band management port.

A Low Maxttl Causes Traceroute To Halt Before Reaching the Destination Address. For example, executing traceroute with its default values for a destination IP address that is four hops away produces a result similar to this:

Intermediate router hops

with the time taken for the

switch to receive

acknowledgement of each probe reaching each router.

Destination IP Address

Figure C-14. Example of a Completed Traceroute Enquiry

Continuing from the previous example (Figure C-14, above), executing traceroute with an insufficient maxttl for the actual hop count produces an output similar to this:

Traceroute does not reach destination IP address because of low maxttl setting.

The asterisk indicates there was a timeout on the second probe to the third hop.

Figure C-15. Example of Incomplete Traceroute Due to Low Maxttl Setting

C-63